[Bug 680444] Re: dbus-daemon eats 100% cpu and is not responsive

[Zach Welch]

Contrary to the current status, this bug does not appear to have been
fixed in Natty. It is readily reproducible, though apparently non-
deterministic. Exiting some applications that use dbus will help
temporarily, but the symptoms invariably reappear when given enough
uptime.

Based on the strace log provided in the initial report (and my own
investigation), it looks like dbus leaks file descriptors in some
circumstances, leading to a livelock situation when calling accept.

I am running dbus-1.4.6ubuntu6, so the conclusion that this was fixed in
1.4.6ubuntu was incorrect. This bug needs to be reopened and reexamined.

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Title:
  dbus-daemon eats 100% cpu and is not responsive

Status in “dbus” package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: dbus

  strace shows the following:

  sudo strace -p 1464
  Process 1464 attached - interrupt to quit
  clock_gettime(CLOCK_MONOTONIC, {349519, 662737789}) = 0
  poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=12, events=POLLIN}, {fd=13, events=POLLIN}, {fd=15, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=18, events=POLLIN}, {fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=14, events=POLLIN}, {fd=22, events=POLLIN}, {fd=21, events=POLLIN}, {fd=25, events=POLLIN}, {fd=24, events=POLLIN}, {fd=26, events=POLLIN}, {fd=27, events=POLLIN}, {fd=29, events=POLLIN}, {fd=23, events=POLLIN}, {fd=31, events=POLLIN}, {fd=32, events=POLLIN}, {fd=33, events=POLLIN}, {fd=34, events=POLLIN}, {fd=35, events=POLLIN}, {fd=36, events=POLLIN}, {fd=39, events=POLLIN}, {fd=38, events=POLLIN}, {fd=37, events=POLLIN}, {fd=42, events=POLLIN}, ...], 1018, -1) = 1 ([{fd=3, revents=POLLIN}])
  clock_gettime(CLOCK_MONOTONIC, {349519, 664920388}) = 0
  accept4(3, 0xbfcd9aac, [16], SOCK_CLOEXEC) = -1 EMFILE (Too many open files)
  fcntl64(-1, F_GETFD)                    = -1 EBADF (Bad file descriptor)
  clock_gettime(CLOCK_MONOTONIC, {349519, 665068808}) = 0
  poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=12, events=POLLIN}, {fd=13, events=POLLIN}, {fd=15, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=18, events=POLLIN}, {fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=14, events=POLLIN}, {fd=22, events=POLLIN}, {fd=21, events=POLLIN}, {fd=25, events=POLLIN}, {fd=24, events=POLLIN}, {fd=26, events=POLLIN}, {fd=27, events=POLLIN}, {fd=29, events=POLLIN}, {fd=23, events=POLLIN}, {fd=31, events=POLLIN}, {fd=32, events=POLLIN}, {fd=33, events=POLLIN}, {fd=34, events=POLLIN}, {fd=35, events=POLLIN}, {fd=36, events=POLLIN}, {fd=39, events=POLLIN}, {fd=38, events=POLLIN}, {fd=37, events=POLLIN}, {fd=42, events=POLLIN}, ...], 1018, -1) = 1 ([{fd=3, revents=POLLIN}])
  clock_gettime(CLOCK_MONOTONIC, {349519, 667222733}) = 0
  accept4(3, 0xbfcd9aac, [16], SOCK_CLOEXEC) = -1 EMFILE (Too many open files)
  fcntl64(-1, F_GETFD)                    = -1 EBADF (Bad file descriptor)
  .................

  System info:
  Kubuntu 10.10
  ubuntu-bug does not work by the way because it tries to connect to dbus

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